Method of treating coated material.



G. A GILBERT & M. L. DAUGHERTY.

METHOD OF TREATING COATED MATERIAL.

APPHCATION FILED APR. 3. 1916.

1,20%,151. Patented Nov. 7,1916.

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GEORGE A. GILBERT AND LEATTHEW DAUGHEBTY, 0F NOBWOOD, OHIO.

METHOD 01E TREATING COATED MATERIAL.

Application filed April 3, 1916.

T 0 all whom it may concern Be it known that we, GEORGE A. GILBERT and MATTHEW L. DAUGHERTY, citizens of the United States, and residents of Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in the Methods of Treating Coated Material, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification.

Our invention relates to the method em ployed in the construction of tin containers and the like, wherein a sealing fluid is placed around the edges of the portions of the container to be sealed, and then cooled and dried. The fluid consisting of waxes and powders must be dissolved in benzol or a like product before it iscapable of being applied to the can and it must then be heated and dried and cooled.

In the past there have been a number of ways of treating the metal parts coated with sealing fluid, dissolved in benzol or like solvents. Among these there has been a system of heating the metal parts after coating and entirely driving off the benzol by means of the heat. It would be possible to employ such a heater with a condenser, thereby saving the driven-off benzol, but the requirements of amanufacturing plant are such that a heater and condenser to accommodate all of the parts coated with sealing fluid would have to be so large that it would be too expensive. The usual method of the past has accordingly been to .eat the parts coated with the fluid in a drying oven and then to set the parts out in the open air in racks to cool and dry, which usually takes several hours or more.

To heat the parts, the usual method has been to run them through a drying kiln on a belt conveyer, and to keep them as long as possible in the kiln. Too great a heat cannot be used, however, and in order to have a sufficient supply to keep a large plant moving, the requirements are such that the benzol is usually only half driven off when the parts emerge from the kiln. For this reason, they must stand a long while in racks, and it has been found that if they cool too rapidly, the condensation of the benzol or the like will prevent its drying ofl even in such time. It would be possible to place the parts such a heater subject to Specification of Letters Patent.

Patented Nov. '7, rate.

Serial No. 88,466.

ing and cooling without the loss of the benzois employed as solvents for cutting the waxes and powders of the sealing compound.

It is also our object to utilize the heat in the parts themselves to energize the drying and cooling operation and the condensation of the benzols and the like, and generally to provide a method of handling the treated parts very inexpensively.

These objects we accomplish by that certain method of treatment which will be hereinafter more specifically pointed out and claimed.

in the drawing, F ure 1 illustrates one l end of a heater of elementary type to be used in our method, in longitudinal section. Fig. 2 is a perspective section of a drying and cooling chamber having a double lining for an air passage, as employed in our method.

The structure shown comprises a casing l mounted on a table 2, within which is a gas burner 8. An endless belt conveyer 4., upon which, in this instance, are deposited the ends of tin containers 15, travels through the casing for heating the tins over the burners. The drying and cooling device comprises a box 5 having an inner chamber 6. The chamber opens at the top at 7, 7, into the space 8 between the two parts, and the inner chamber walls have openings 9 at the base leading from said space into the chamber. A wire screen 10 supports the tin parts above the fioor of the box, and the box is preferably set on top of a set of water pipes 11. A. spout 1:2 allows the condensed fluids to flow out of the box and a lid 13 is provided to fit down over the box, closing it from the outer air.

The parts .just described are in part the usual heating devices, and as to the box, are intended to illustrate any form of double-walled container, air tight and set upon a cool base, such as a floor in winter or a water pipe coil in summer.

Our method of treatment is as follows: First the tin parts are treated with the sealing fluid, dissolved in benzol or the like. The said parts are then set on the conveyer which carries them over the gas burners, in the usual manner. It is not desired to retain the treated parts a long time in the heater, but on the contrary to employ this heater to bring them to a temperature of one hundred and thirty to one hundred and fifty degrees Fahrenheit, as quickly as practicable without excessive heating at any one point. We do not wish the parts to remain in the heater for too long a time because it is our purpose to condense the benzol and to avoid the expense of doing so in the heater. As the tins are delivered from the heater on the belt conveyer they are removed, hot and placed in the box, and the lid closed down. The cost of construction of a box, as described, is very small and a number of them should be provided, same to be set over water coils in summer time so as to keep the base of the box at a temperature of fifty to seventy degrees Fahrenheit. When a box is filled, which, as the size is small, will be done very quickly, the lid is closed and the heated parts allowed to remain in it for about one hour. They may then be removed, as they will be cooled, and dried.

The operation within the box is as follows: The heat of the tin parts causes a circulation up through the chamber and down through the spaces in the box walls. This air is warm, and will not cool rapidly, as it is continually heated from the tin parts. The base of the box being at say sixty degrees Fahrenheit, causes a gradual condensation of the benzol, and the heat of the air from the tin parts will allow them to cool gradually but not to become cool quickly, causing a condensation on them of the benzol.

Accordingly it will be seen that without expensive driers, with a considerable economy in the size of heater and by utilizing the heat of the tin parts, we are enabled to accomplish a quicker drying and cooling of the treated parts, and at the same time to save the benzol used as a solvent, without the expense of a refrigerating machine and in cool Weather without any artificial cooling whatever.

It will be understood that whereas tin cans are spoken of in this specification, and

whereas this invention is especially valuable as far as our present knowledge goes in the can making, still that we do not wish to be limited to this particular art in the application of our novel process or method. On the contrary we Wish the claims that follow to be entitled in their interpretation to the full exercise of the doctrine of equivalents, and that the invention be used in the future in any art in which it may turn out to be economical and convenient, embracing in its scope the nonessential changes necessary to adapt it to the new art.

Having thus described our invention,

what we claim as new and desire to secure by Letters Patent, is:

1. The method of treating material coated with solids dissolved in benzol or the like,

which consists in heating said material, then transferring it to a closed receptacle and utilizing the heat of the heated material to cause a circulation in said receptacle for warm drying and condensation.

2. The method of treating material coated with solids dissolved in benzol or the like, which consists in rapidly heating said material, then transferring it to a closed receptacle, applying a cooling medium to the receptacle, and utilizing the heat of the heated 'material to cause a circulation in said receptacle for Warm drying and condensation.

3. The method of treating material coated with solids dissolved in benzol or the like, which consists in heating the material to a temperature between one hundred and fifty and one hundred and seventy degrees Fahrenheit, transferring said material to a closed receptacle, applying a cooling medium of temperatures'between fifty and seventy degrees Fahrenheit to said receptacle and utilizing the heat of the heated material to cause a circulation in said receptacle for warm drying of the parts and condensation of the benzols.

4:. The method of treating tin parts coated with sealing fluid dissolved in benzol, which consists in quickly heating said parts so as to bring them to a temperature between one hundred and fifty and one hundred and seventy degrees Fahrenheit without driving tion in said receptacle for Warm drying and condensation.

GEORGE A. GILBERT. MATTHEW L. DAUGHERTY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

